Erzia_Linearity_Measurement_Tech_Brief

DEVICE UNDER TEST
The device under test is a new COTS power amplifier designed for Ka-Band Satellite
Communications applications, based on a GaN output stage to maximize power and size
efficiency. Table 1 shows Its main characteristics.
Table 1: ERZ-HPA-2750-3100-46 Specifications summary
Min Typ Max Unit
Frequency 27.5 — 31 GHz
Output Power (Psat) @CW 45 46 46.5 dBm
Output Linear Power @ACPR>25dBc
(OQPSK Modulation)
— 44 — dBm
Small Signal Gain 70 75 80 dB
Gain Flatness — ±3 — dB
VSWR input — 1.5:1 — —
VSWR output — 1.5:1 — —
DC Voltage 18 24 36 V
Power Consumption @Psat — 210 240 W
RF Connectors 2.92mm (F) IN / WR28 OUT —
DEVICE TEST SETUPS
TEST SETUP 1 TEST SETUP 2
A PNA together with a power sensor for calibration
purposes are used to perform S-parameters, P1dB and Psat
measurements. A power supply is used to bias the device.
A signal generator with vector signal generation capabilities
and a spectrum analyzer with complex signals measurements
capabilities is used to perform two-tone and ACPR
measurements.
TECH BRIEF | Comparing Linearity Measurements in a GaN Ka-Band Satcom Power Amplifier 4